Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

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Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified HVAC Companies Rated Highest in Quality?

Photo: Calvey Heating & Air (2017)

You are the customer. If your goal is to choose an air conditioning, heating and ventilation contractor that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified HVAC contractor. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated HVAC company

You are the customer. If your goal is to choose an air conditioning, heating and ventilation contractor that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified HVAC contractor. Each has been rated Highest in Quality in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top-rated HVAC company and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top-rated status.

3) Full Disclosure: By clicking the name of a company above you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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DIAMOND CERTIFIED EXPERT CONTRIBUTORS IN THE San Mateo County – Air Conditioning, Heating & Ventilation (HVAC) CATEGORY

Pat Martinez is owner of West Coast Mechanical, a Diamond Certified company. He can be reached at (831) 241-5070 or by email.

Pat Martinez

diamond certified contributor profile and expert article

Pat Martinez: Service-Oriented

By James Florence, Diamond Certified Resource Reporter

LIVERMORE — After years working on the outskirts of the HVAC industry, Pat Martinez decided to venture further in, not realizing just how far those first few steps would eventually take him. “I used to work as a warehouse manager for a supplier of HVAC air filters,” he recounts. “At a certain point, I was feeling tired of managing people and wanted to do something a little more hands-on. I saw these HVAC technicians coming into the warehouse every day and I figured, ‘Why not try that?’ I ended up getting into the union and becoming an apprentice. The funny thing is, soon after I started, my boss basically put me in charge and had me running jobs, so I fell right back into managing people. I guess it just came naturally to me, and he must have seen that.”

After 14 years working for the same company, Pat came to a crossroads that would alter his career’s trajectory. “The company owner was moving toward the construction side of things, whereas my interest was more service-oriented. I had a decision to make: I could stay on and keep moving in that direction or go off on my own. In the end, I chose the latter. I started my own HVAC service company in 2016 and haven’t looked back.”

Today, as owner of West Coast Mechanical, Pat says his favorite part of his job is making customers comfortable. “Most people come to us when their heaters or air conditioners aren’t working and they’re uncomfortable in their homes. Naturally, when we get their systems working again, they’re really happy, so we get a lot of joy from that.” 

A resident of San Jose (where he lives with his wife, Georgina), Pat spends his time outside of work on a variety of active pastimes. “I enjoy outdoor activities like camping and boating,” he details. “Vacations are always nice when we can get them in. I like traveling to new places, seeing new things and having new experiences.” Pat also likes spending time with his three adult children. “Georgina and I have two sons, both of whom are in the HVAC trade, and one daughter. Even though they’re all out of the house at this point, we still get together for Sunday dinners a couple of times a month.”

In his life and career, Pat espouses a simple philosophy. “You have to work hard if you want to play hard,” he says. “In order to enjoy the finer things in life, you need to work hard for them. Nothing comes easy, but if you put in the hours, things will pay off in the long run.”

When asked the first thing he’d do if he were to retire tomorrow, Pat says he’d see the world. “I’d like to travel abroad—that’s something I haven’t done a lot of. There’s a lot a world out there full of beautiful things to see, so if I had the time and money, I’d definitely go see them.”

Ask Me Anything!

Q: What was your first job?

A: I was a paperboy when I was 11 years old. My first job as an adult was at a welding shop.

Q: What’s your favorite sports team?

A: The San Francisco 49ers.

Q: If you could travel anywhere in the world, where would you go?

A: Probably Italy.

Q: What’s your favorite holiday? 

A: It’s a tie between Thanksgiving and Christmas because I enjoy the family get-togethers.

Q: What do you like on your pizza? 

A: Just about everything.

Read more

Understanding HVAC Maintenance


LIVERMORE — You’ve probably heard that HVAC maintenance is important, but you may not know why it’s important or what exactly it consists of. To provide further insight, here’s some basic information on HVAC maintenance. Why is HVAC maintenance important?… Read more

Expert Video Tip

Video: Benefits of HVAC Maintenance

Complete Video Transcription:

LIVERMORE — Pat Martinez: Why is HVAC maintenance important? It lowers your utility bills. It extends the life of your system. You'll have healthier air… Read more

Ricardo Valderrama is a veteran of the HVAC industry and owner of Bayhill Heat & Air, a Diamond Certified company since 2010. He can be reached at (650) 469-3972 or by email.

Ricardo Valderrama

diamond certified contributor profile and expert article

Ricardo Valderrama: Imported Expertise

By James Florence, Diamond Certified Program Reporter

SAN MATEO — Ricardo Valderrama was raised in the heating and cooling industry, so it didn’t take long for him to take up his family’s trade—an enterprise he began in his native country of Peru before fully realizing it in the United States. “Growing up, my family had a commercial heating and air conditioning business, so I decided to follow that path and went to university to study industrial engineering,” he remembers. “During that time, my grandmother brought me with her on vacation to San Francisco, and I quickly fell in love with the city.” Upon completing his university term in Peru, Ricardo returned to the U.S. to attend trade school before going to work for a San Francisco HVAC contractor. Five years later, he struck out on his own and founded Bayhill Heat & Air.

More than 30 years later, Ricardo says his favorite part of his job is the opportunity to interact with a wide variety of people. “I enjoy meeting and, in many cases, becoming friends with people from all different backgrounds. Living and working in the Bay Area, I’ve probably met someone from every country, which has been very rewarding and given me a more comprehensive perspective of the world.”

Outside of work, Ricardo engages in a variety of pastimes, from gardening at his San Mateo home to savoring the fruits of the Wine Country. “I enjoy going to the Napa Valley with friends and family to enjoy good wine and the beautiful countryside,” he says. Additionally, since he has family spread across the Western United States, Ricardo does a fair amount of traveling to visit his children and grandchildren. “I have a son in Texas, two daughters in Utah and one daughter here in San Mateo. I actually just got back from Austin, where I attended my grandson’s third birthday party.”

In his professional career, Ricardo espouses the importance of providing value for his clients. “My primary goal is to give my clients the most for their money,” he affirms. “With every installation, rather than trying to sell the most expensive equipment, I help the customer choose a system that best fits their needs. Basically, it comes down to being honest and giving them a product that will provide a good long-term investment.”

When asked the first thing he’d do if he could retire tomorrow, Ricardo says he’d go on an Alaskan cruise. “That’s one of the top things on my bucket list. Other than that, I’d just spend more time doing the things I currently enjoy, like winetasting, gardening, and visiting with friends and family.”

Ask Me Anything!

Q: What’s your favorite sports team?
A: The San Francisco 49ers.

Q: Music or talk radio?
A: Talk radio.

Q: If you could time travel, would you go to the past or the future?
A: The future, just to see what it’s going to be like. I already know about the old stuff; I want to know what’s coming.

Q: What’s your favorite type of food?
A: I love Asian cuisine, particularly Japanese fresh leaf sushi.

Q: What were you most known for in high school?
A: Being a funny guy. Not a class clown, just generally funny and able to make light of things.

Read more

Getting Your Air Conditioner Ready for Summer


SAN MATEO — As we head into summer, it’s a good time to check your air conditioning equipment and make sure it’s running as cleanly and efficiently as possible. Start by checking your air filter; if it’s dirty, replace it before you… Read more

The Next Generation of Smoke and CO Detectors


SAN MATEO — On July 1, 2015, a new law will go into effect that aims to phase out conventional, battery-operated smoke and carbon monoxide detectors in favor of new, one-use-only models. Equipped with tamper-proof 10-year batteries, the new alarms… Read more

Expert Video Tip

Video: Annual Air Conditioning Maintenance

Complete Video Transcription:

SAN MATEO — Host, Sarah Rutan: As the warm summer weather sets in, it’s time to get your air conditioner primed for optimum performance. Today we’re in San… Read more

Vincent Casale is an estimator at Bayside Mechanical, Inc., a Diamond Certified company since 2010. He can be reached at (650) 578-9080 or by email.

Vincent Casale

diamond certified contributor profile and expert article

Vincent Casale: Winds of Change

By James Florence, Diamond Certified Resource Reporter

SAN MATEO — After several years working on the corporate end of the construction industry, Vincent Casale was looking for a change of pace. As it happened, change came in the form of an entirely new livelihood. “After about 15 years in corporate sales and construction management, I wanted to get out of that world and work on a smaller scale,” he remembers. “One day, while I was on a jobsite, I met the owner of Bayside Mechanical. We got to talking, and the next thing you know, he brought me on. My prior experience in construction helped me as I became acquainted with a new industry, and things ended up working out very well.”

Today, as estimator at Bayside Mechanical, Inc., Vincent says his favorite part of his job is making people feel more at home in their homes. “Working in the residential end of the business, I really feel like I’m helping people. For me, it’s not working on houses; it’s working on homes, which I think is an important distinction. I take a lot of pride in making my customers’ homes more comfortable and just improving the quality of their daily lives.”

Originally from Brooklyn, New York, Vincent came to the Bay Area soon after marrying his wife, Heather. “Heather is originally from here,” he explains. “We met while she was attending grad school in New York. She always said if we started a family, she’d like to live closer to her family, so as soon as we found out our first little one was on the way, we picked up and headed west.” Today, as a resident of Redwood City (where he lives with Heather and their three daughters, Isabella, Sophie and Emily), Vincent says his two favorite things about his adopted locale are the weather and traffic, both of which he considers moderate in comparison to those of his city of origin.

Vincent spends most of his time outside of work performing his role as a full-time family man. “I love being a father to my daughters and spending time with my family—they definitely keep me busy,” he laughs. He also enjoys cooking and following professional sports. “My family has a bunch of restaurants back east, so cooking has always been a big hobby of mine. I’m also a huge sports fan, and I follow all my New York teams.”

In regard to a personal philosophy, Vincent sums it up with one word: integrity. “In my mind, it’s not what you do in front of people that’s important—it’s what you do when no one is watching,” he explains. “That’s the true test of your character and how you develop trust and relationships with others. So, I’m always trying to instill the importance of integrity in those around me, whether it’s my kids at home or my crew out on the jobsite.”

When asked the first thing he’d do if he were to retire tomorrow, Vincent says he’d head to an exotic location to get some R&R. “I’d take a nice, long vacation. I’d love to go to Hawaii with my family for a few weeks and spend some time at the beach just kicking back and relaxing.”

Ask Me Anything!

Q: What are your favorite sports teams?
A: Being from Brooklyn, my two favorite teams are the New York Jets and the New York Mets.

Q: Music or talk radio?
A: It depends on my mood. Usually, I listen to sports talk radio in the morning, but as my day gets going, I put on music.

Q: What kind of music do you like?
A: Classic rock.

Q: What’s your favorite kind of food?
A: Italian.

Q: What were you most known for in high school?
A: Playing baseball. I also had a lot of friends from different social groups, so I guess I was also known for getting along with everyone.

Read more

DIY Air Duct Inspection


SAN MATEO — A common problem homeowners experience with their HVAC systems is inadequate or uneven airflow. While an HVAC company can resolve your airflow issues, before calling a professional, it’s worthwhile to perform a quick visual inspection of your ductwork… Read more

Expert Video Tip

Video: DIY Ductwork Inspection

Complete Video Transcription:

SAN MATEO — Host, Sarah Rutan: If you’re experiencing airflow issues in your home, take a few minutes to inspect your ductwork before calling a professional.… Read more

Rick Lazzarini is a veteran of the HVAC industry and co-owner of Degree HVAC, Inc., a Diamond Certified company. He can be reached at (650) 530-0989 or by email.

Rick Lazzarini

diamond certified contributor profile and expert article

Rick Lazzarini: A Joint Venture

By James Florence, Diamond Certified Resource Reporter

REDWOOD CITY — When asked how he became the owner of an HVAC company, Rick Lazzarini says it was a joint venture. “I started Degree HVAC in 2005 with my business partner, Trini Gudino. We originally met in trade school, where we spent five years training to be union pipefitters. One day, I told him I was thinking about starting my own business, to which he replied, ‘Really? So am I.’ One thing led to another and we decided to partner up to achieve our mutual goal. We started out in my garage; today, we’re in an 8,500-square-foot building.”

As co-owner of Degree HVAC, Inc., Rick says his favorite part of his job is improving his customers’ quality of life. “Most people don’t realize the difference a new, energy-efficient HVAC system can make in their energy bills and level of comfort. It’s very satisfying to upgrade a customer from old, inefficient equipment to a new system that’s going to make them happy for the next 20 to 30 years.”

A resident of Redwood City (where he lives with his wife, Christina, and their children), Rick expresses his appreciation for the temperature and temperament of his Bay Area locale. “The weather is always good, the people are nice and the atmosphere is pretty laid back. It’s California living, so we’re pretty fortunate to be here.”

Outside of work, Rick engages in a variety of active pastimes. “I have a Harley-Davidson, so I like to get out and ride whenever I can,” he says. “I go up to the Russian River a lot, both on my bike and with my family. I also like reading and having family get-togethers—I have a lot of family in the area, so we’re always celebrating birthdays and holidays.”

In his life and career, Rick espouses the wisdom of the Golden Rule. “My philosophy is, ‘Do unto others as you would have them do unto you,’” he affirms. “In terms of my business, that means being sensitive to my customers’ budgets and never selling them something they don’t need. Not everyone can afford a new furnace in the dead of winter—which is when they usually break down—so we do what we can to provide affordable solutions to their problems.”

When asked the first thing he’d do if he were to retire tomorrow, Rick says he’d hit the road. “We live in a great country and I’d like to see more of it, so I’d probably take a long road trip around the United States. South Dakota, New Orleans, the Great Lakes…I have a pretty long list!”

Ask Me Anything!

Q: What’s one book that has been particularly influential for you?
A: The Bible.

Q: What’s your favorite local restaurant?
A: Redwood Grill in Redwood City.

Q: What was your favorite toy as a child?
A: My Red Ryder BB gun.

Q: Music or talk radio?
A: Music.

Q: What kinds of music do you like?
A: All kinds, from jazz to country to rock ’n’ roll.

Read more

Simple Tip for Fresher Indoor Air


REDWOOD CITY — When your HVAC system is running, it’s not only heating or cooling your home, it’s also circulating the air. That’s why in mild seasons like spring (when your system is seldom in use), your indoor air can become… Read more

Expert Video Tip

Video: Tip for Fresher Indoor Air

Complete Video Transcription:

REDWOOD CITY — Host, Sarah Rutan: If you want fresher indoor air, you’ll be glad to know there’s a simple way to get it. Today we’re in… Read more

Mike Rebholtz is general manager of Alternative Heating & Air Conditioning Solutions, Inc., a Diamond Certified company since 2012. He can be reached at (650) 539-9722 or by email.

Mike Rebholtz

diamond certified contributor profile and expert article

Mike Rebholtz: Expert Contributor Profile

By James Florence, Diamond Certified Program Reporter

MENLO PARK — Following a year spent living abroad, Mike Rebholtz returned home and started working in a trade that would furnish him with a lifelong career. “I had a buddy whose family lived in Aviano, Italy, right at the foot of the Alps,” he explains. “After I graduated high school, I sold everything I had and went to live there and ski, which lasted a year. After I got back, I needed a real job, so I joined the trade union and started working in HVAC.” As a mechanically inclined individual, Mike says he quickly took to the trade. “I’ve always been good with my hands and liked building things, so working with sheet metal and manufacturing ductwork was something I enjoyed right off the bat.”

In 1985, Mike founded Rebholtz Mechanical, which functioned as a unionized HVAC contracting firm for more than 20 years before closing its doors amid the economic downturn of 2008. In 2011, Mike re-emerged on the professional scene with Alternative Heating & Air Conditioning Solutions, Inc. As his first non-union business venture, Mike says he’s enjoyed the refreshing change of pace. “We’re able to do a lot of things we couldn’t under union constraints, like bringing in plumbers and electricians, which allows us to provide our customers with more options. It’s been really fun to get a fresh start after so many years in the industry.”

Originally from the Sacramento region, Mike resides today in Redwood Shores with his wife, Julie. When asked his favorite part of living and working in the Bay Area, he says he appreciates the diversity of the population. “I originally planned to move up to Oregon and live in the country, but I’ve grown to like the diversity we have here. Overall, I find that consumers in the Bay Area tend to be very educated and open-minded.”

Outside of work, Mike engages in a wide variety of active pastimes. “I can’t get enough of the outdoors, whether it’s riding my motorcycle, fishing or backpacking in the Sierras,” he says. As a licensed pilot, Mike says he and Julie also enjoy flying to nearby destinations for weekend trips. Additionally, he likes spending time with his children.

In regard to his professional career, Mike espouses the importance of doing the right thing. “The main things are to be fair and honest, see things from the customer’s perspective, and give them what they want,” he says. “If a customer wants something that’s not in the contract, I’ll usually tell my guys to include it anyway, because I’m less concerned about who’s right than I am about making sure my customers are happy.”

When asked the first thing he’d do if he could retire tomorrow, Mike says he’d head out on a long trip. “I’d probably take Julie and the kids and shoot up to Alaska for a few weeks, which is somewhere I’ve always wanted to go. Ideally, I’d like to fly there and stop in Oregon and Washington along the way to visit friends and family.”

Ask Me Anything!

Q: Would you ever go sky diving?

A: Yes, that’s actually on my bucket list.

Q: What’s your favorite local restaurant?

A: The Mountain House Restaurant in Woodside.

Q: What’s your favorite thing to do on a rainy day?

A: Read a book.

Q: What kind of books do you like to read?

A: I like everything from mystery novels to self-improvement books. As a pilot, I’m also fascinated by World War II stories, so I love any book that has to do with that era.

: How do you like your eggs?

A: Over easy.



Read more

The Benefits of Air Duct Replacement


MENLO PARK — If you’re planning to replace your furnace, there’s a chance you may need to replace your air ducts as well. Due to a recent Title 24 mandate, Bay Area residents planning for furnace replacements are now required… Read more

Heat Pumps for HVAC


MENLO PARK — A lot of homeowners are interested in lowering their gas bills, especially when it comes to running their heating and cooling systems. One great option for those who have or are planning to install solar energy systems… Read more

Expert Video Tip

Video: Advancements in Heat Pump Technology

Complete Video Transcription:

MENLO PARK — Host, Sarah Rutan: If you’re thinking about switching to solar power in your home, you should also consider installing a heat pump for your HVAC… Read more

Juan Sandoval is a veteran of the HVAC industry and president of Carol Flynn, Inc., a Diamond Certified company since 2005. He can be reached at (650) 530-0965 or by email.

Juan Sandoval

diamond certified contributor profile and expert article

Juan Sandoval: True Potential

By James Florence, Diamond Certified Program Reporter

SAN MATEO — While he’s found success as the owner of a Bay Area HVAC company, Juan Sandoval may never have reached his true potential if it wasn’t for an insistent employer who pushed him beyond his comfort zone. “I started in this industry back in 1987,” he says. “I had applied for a job as an air duct cleaning technician with a local service company, but the owner wanted to put me in sales. I didn’t feel that I was salesman material, but he insisted, so I decided to give it a shot. As it turned out, I actually did very well at it.” A couple of years later, Juan went to work for another company called Carol Flynn, Inc., where he gradually worked his way up the ladder until he reached the uppermost rung.

Today, as president of Carol Flynn, Juan says his favorite part of his job is the simple satisfaction of improving people’s day-to-day lives. “I enjoy meeting new customers and helping them increase their comfort by providing heating and air conditioning systems that meet their needs.”

Born in Mexico, Juan was brought to the United States at the age of three and grew up in Redwood City. Today, as a resident of Antioch, he expresses his appreciation for life and work in the Bay Area. “I like the diversity we have here, with so many different nationalities in one place,” he affirms. “Also, the weather is great, and there are a lot of good opportunities for aspiring professionals.”

Outside of work, Juan devotes most of his time to being with his family, which consists of his wife, Catalina, their four children and two grandchildren. “I really enjoy my family,” he says. “We have a pool in our backyard, so during the summer our kids and grandkids come over a lot for swimming and barbequing.” Juan has even found a way to turn his favorite hobby of golf into a family activity. “My kids, my wife and I all play golf, so we regularly go out to the course and play together.”

In his life and career, Juan espouses the wisdom of a motto passed down by his grandfather. “My grandfather used to tell me, ‘If you help people get what they need, you’ll always have what you need,’” he recalls. “Over the years, I’ve found that this holds true. More often than not, if you do right by others and project positivity, you’re going to get positivity in return.”

When asked the first thing he’d do if he were to retire tomorrow, Juan says he’d tee off for an extended holiday. “I would probably start by playing a round of golf. Then, I’d go on vacation in Cabo San Lucas and just relax.”

Ask Me Anything!

Q: What’s your favorite sports team?
A: The San Francisco 49ers.

Q: What’s your favorite holiday?
A: Christmas—I like the lights, cheerful atmosphere and family time.

Q: What’s the best gift you’ve ever received?
A: My children.

Q: What’s your favorite local restaurant?
A: Mr. Teriyaki in Burlingame.

Q: What’s your favorite TV show?
A: “America’s Got Talent.”

Read more

The Other Reason to Change Your Furnace Filter


SAN MATEO — When people talk about the importance of changing furnace filters, the conversation usually revolves around air quality. Obviously this is a concern, as 85 percent of the air you breathe inside your home is first circulated through your HVAC… Read more

Expert Video Tip

Video: Replacing Your Air Filter

Complete Video Transcription:

SAN MATEO — Host, Sarah Rutan: In order to maximize both furnace performance and indoor air quality, it’s important to change your air filter on a regular basis.… Read more




  • Carrier

  • Rheem

  • Trane

  • Lennox

  • Mitsubishi

  • Amana

  • Bryant

  • Ares

  • First Air

  • Goodman

Carrier Heating & Cooling

Broadmoor Village
Daly City
East Palo Alto
El Granada
Emerald Hills
Foster City
Half Moon Bay
La Honda
Loma Mar
Menlo Park
Moss Beach
Palomar Park
Portola Valley
Princeton by the Sea
Redwood City
San Bruno
San Carlos
San Gregorio
San Mateo
Sharp Park
South SF
West Menlo Park


American Backflow Prevention Association (ABPA) (www.abpa.org/)
Air Conditioning Contractors of America (ACCA) (www.acca.org/)
Associated General Contractors of America (AGC of America) (www.agc.org/)
Associated Specialty Contractors (ASC) (www.assoc-spec-con.org/)
American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) (www.ashrae.org/)
California Sheet Metal and Air Conditioning Contractors National Association (CALSMACNA)
(www.cal-smacna.org/)Contractors State License Board (CSLB) (www.cslb.ca.gov/)
Mechanical Contractors Association of America (MCAA) (www.mcaa.org/)
National Board of Boiler and Pressure Vessel Inspectors (NBBPVI) (www.nationalboard.org/)
North Coast Builders Exchange (NCBE) (www.ncbeonline.com/)
Heating, Cooling Contractors Association (PHCCA) (www.phccweb.org/)
Refrigeration Service Engineers Society (RSES) (www.rses.org/)
U.S. Environmental Protection Agency (EPA) (www.epa.gov/)
American Boiler Manufacturers Association (ABMA) (www.abma.com/)
Hydronic Heating Association (www.comfortableheat.net/)

Know What You Want
Know What You Want from Your New Home Heating and Cooling System

Before you interview any heating, cooling and ventilation system contractors in San Mateo County, you’ll want to have some knowledge about HVAC systems and your heating and cooling needs.

Think about the answers to these questions to get you started in the right direction:

  • Do I want a Diamond Certified company that is rated best in quality and backed by the Diamond Certified Performance Guarantee?
  • What is my budget for new HVAC system or heating and air conditioner repair?
  • What do I like about my current HVAC unit?
  • What would I change about the HVAC system that’s currently installed in my house?
  • Are there any specifics that will make this job more complicated than average or need to be considered during the planning phase (i.e. planning an addition to the home, special requests for the brand or type of system installed, location of the job site or a narrow driveway that may make it hard for work trucks to get to the home, a short timeframe, etc.)?
  • Do I plan to live in this home long-term? Or is it a rental property or a house I plan to sell?
  • What qualities or characteristics do I want in a San Mateo County HVAC contractor?

Interview Good Heating and Cooling Contractors in San Mateo County
Once you’ve decided what you want from your new heating and cooling system, talk with a few local HVAC contractors in San Mateo County and ask them a few questions. You’ll get better results if you write down your questions and keep a record of the answers you get from each of the heating and cooling specialists you interview. The following are some sample questions to start the process.

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What To Ask In Person
Questions to Ask San Mateo Heating, Cooling and Ventilation Companies in Person

Once you’ve narrowed down your list to the good HVAC companies in San Mateo or your area, invite a few to your home to bid on your job.

Seeing your current HVAC equipment, the size of your home and other factors will enable the home heating and cooling specialists to give you a more accurate estimate for air conditioner and heater repair or HVAC unit replacement.

The following are questions you may want to ask during your in-person interview:

  • Do you also recommend new heating and air conditioning ducts, or will the existing ducts work with my new heating and cooling system?
  • How much time will the HVAC job take, from measuring my home and ordering the new heating and air conditioning system to installation?
  • Will my new heating, cooling and ventilation system make my home more comfortable and reduce my electric bills?
  • Do you have any recent projects in my area of San Mateo County where I can see the completed HVAC installation and talk with the homeowners?
  • Do you have customer references I can call?
  • How would I handle any future service issues? Are you responsible for warranty work if there’s ever a problem with my new HVAC system?
  • What can I do to make the heater and air conditioner purchase / installation process easier?
Read moreRead less
  • What To Ask References
    Previous Customers' Experiences with Local HVAC Contractors in San Mateo County

    It’s best to choose a Diamond Certified heating and cooling contractor because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a HVAC contractor in San Mateo County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.

    If you can’t find a Diamond Certified HVAC company within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by the heating and air conditioning companies. Keep in mind, though, that references provided to you by the contractors are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process. That’s because references given to customers from local HVAC companies are often cherry-picked instead of randomly selected from all their customers. So the contractors will likely give you a few customers to call that they know are satisfied.

    If you do call references on your own, specifically ask for a list of the company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied. Then call several of the references and ask them specific questions about the heating and air conditioning contractor you’re considering. Here are a few sample questions:

    • Were you satisfied with the HVAC installation and the customer service from _(HVAC company name)_?
    • What type of job did they do for you (HVAC repair, cooling & heating installation, residential air conditioning service, HVAC unit replacement, furnace repair, etc.)?
    • Did the San Mateo County heating and cooling contractor you hired complete the work on time?
    • Did the contractor keep you up-to-date on the status of the project?
    • Were there unexpected costs? If so, what were they for and were they avoidable?
    • If you live in a smaller town such as Sharp Park, Atherton, Colma, East Palo Alto, Montara, Moss Beach, La Honda and Loma Mar, did the HVAC company charge extra to travel to your home?
    • Did the HVAC installers show up on time?
    • Did they clean up after installing your new furnace or air conditioning system?
    • If you need a new furnace or HVAC repairs in the future, would you use this contractor again?
    • Would you recommend them to friends or family?
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  • Review Your Options
    Choose Good Heating and Cooling Contractors in San Mateo County

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    A new HVAC system, furnace or home air conditioner is a big investment that should keep you comfortable for years to come. So before deciding on the best heating and cooling contractor in San Mateo County for you, consider the following questions.

    • Can a local heating and cooling contractor in San Mateo County meet your needs in terms of products, scheduling, installation and service?
    • Are the San Mateo County HVAC company representatives knowledgeable on the furnaces and air conditioners they install? Can they tell you which brands and systems best meet your needs and why (i.e. energy efficient furnaces, high-efficiency air conditioners, new furnace installation, Trane HVAC systems, Carrier heaters and AC systems, etc.)
    • Is the HVAC installer sensitive to your budget? Can they offer various brands and heating and cooling systems to fit your needs? Most heating and cooling companies can give you bids for good, better and best options that give you more control over the price and efficiency of your new furnace and air conditioner.
    • Do the written warrantees and guarantees offered by the local San Mateo County HVAC contractors protect you and your new heating, cooling and ventilation system?
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  • How To Work With
    Get the Most Value from Your New HVAC System

    Most homeowners want the best value from their new HVAC system. But sacrificing quality to save money on a new heating and cooling system may defeat the long-term value you can get from a high-quality, efficient HVAC system installed by experienced and skilled heating and air conditioning professionals.

    To help encourage good HVAC contractors in San Mateo County to bid on your job, remember:

    • Look for good value, not just the lowest price. The first question most homeowners ask heating and cooling companies is how much their new furnace and air conditioner will cost, so it’s important to show them you understand the significance of quality products, skilled installation and long-term value.
    • Be upfront with heating and cooling companies if you’re interviewing other local HVAC contractors, but assure them that you’re accepting three fair bids, not dozens of lowball bids.
    • Shop among local heating and cooling companies in San Mateo County. Most HVAC installers like to work in the local area because it allows them to provide better service in a more timely manner. Shopping locally shows contractors you’re not looking for cheap HVAC installations, as some fly-by-night furnace and air conditioning services travel long distances to install discounted products that local contractors may not be able to compete with price-wise.
    • Take the long view when purchasing HVAC equipment. Investing in a quality system and having it installed by professional tradesmen can save you more money in the long run than buying a cheaper system or hiring discount HVAC installers.
    • Remember that the installation can be as important to the long-term reliability and functionality of your heating, cooling and ventilation system. Even the best systems require proper installation and maintenance to operate safely and at maximum efficiency.

    Request a Written Estimate from Your San Mateo County Heating and Cooling Specialist
    When you’ve found a San Mateo County heating and cooling company that meets all of your requirements, it’s time to sort out the details. Ask for a written estimate and contract that includes a confirmation of the brand and quality of your new HVAC system, any installation details, the price of the system and the labor for installation, and any applicable warranties and HVAC maintenance agreements. You should also get in writing a timeline that details the job start date, major milestones and the expected final installation date.

    You may also write in any additional requests or items you and the heating and cooling company representative verbally have agreed upon. Once you’re happy with the contract and understand all the terms of the agreement, you can sign with confidence.

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  • Be a Good Customer
    Be a Good HVAC Service Customer in These Major San Mateo County

    It’s the heating, cooling and ventilation company’s responsibility to put in quality HVAC units using the best possible furnace and air conditioner installation techniques. But you play a big part in the success of your HVAC installation, too. Here are a few simple steps you can take to be a good customer when hiring a heating and cooling contractor in San Mateo County.

    • Be clear and upfront with the HVAC company representative. Let them know what you want from your new furnace and air conditioning unit, the long-term outcome you’re expecting and specific ways they can satisfy your expectations for products and service.
    • Remember, a friendly smile goes a long way.
    • Before you hire an HVAC service in San Mateo County, restate your expectations and goals, and reiterate to the heating and cooling representative your understanding of the agreement. Most problems with local cooling, heating and ventilation companies occur because of a breakdown in communication. You can avoid most conflicts by being clear about your expectations and theirs.
    • Ask your HVAC contractor if you should call to check on the progress or if he will call you with updates.
    • Be sure your service representative has a phone number where they can reach you at all times. The work will move along more smoothly if the heating and cooling company can call you with updates, questions or work authorizations.
    • When your contractor contacts you, return calls promptly to keep the installation or HVAC repairs on schedule.
    • Pay for the work promptly.

    Why would you want to be a good customer? San Mateo County HVAC contractors appreciate customers who are straightforward, honest and easy to work with. Your good customer behavior sets the tone from your end and creates an environment conducive to a good relationship. Things may very well go smoother and any problems may be more easily resolved.

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Check The Work
Review Your HVAC Service Invoice with Your Local Heating and Cooling Contractor

Once your HVAC system is installed, your heating and cooling professional should supply you with a written invoice. This invoice generally will list:

  • The name, physical address and license number of the heating and cooling contractor.
  • A list of all HVAC work performed.
  • An itemized list of the new furnace, air conditioner and ventilation system installed and any replacement parts needed.
  • The total heating and cooling unit installation cost, including an itemized amount due for labor.
  • Any applicable warrantees or guarantees.

It’s smart to compare the work that was actually done to the written document. Ask your cooling and heating contractor to show you the new system installation or HVAC repairs that were done. Check the products and work against the line-item invoice. This is also a good time to have the furnace contractor explain the HVAC unit to you in detail and show you the best steps to take in running and maintaining your new system. If you have questions about the work that was done or any items that seem to be missing or in conflict with your written contract or invoice, this is the time to ask your contractor.

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Written Warranties
Ask San Mateo County HVAC Contractors for Written Warranties and Care Instructions

Before your heating and cooling contractor leaves the job, confirm with them any warranties and guarantees you’ve agreed upon. Not all HVAC companies in San Mateo County offer warranties on their work and products. But if the company you’ve chosen does, they should give you a written warranty that includes:

  • The HVAC contractor’s name and physical business address.
  • What heating and cooling products and work are covered, including whether the contractor will replace or repair your heating and cooling system or give you a refund if you place a warranty claim.
  • Your responsibility if you need warranty work or a replacement furnace or air conditioner (i.e., if you have to pay for labor when filing a claim for warranty work or pay a prorated amount).
  • Terms of and limitations on the new HVAC unit warranty.
  • If the new HVAC system warranty coverage is transferrable to the new owner if you sell your home.
  • Any exclusions to the warranty must be in writing.

You should also ask for written care and handling instructions for your new air conditioner and furnace, including when to change air filters and how to handle service issues. Knowing what steps you should take to preserve your unit can help keep it running and efficient for years to come.

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Top 10 Requests
Top Service Requests Asked of San Mateo County HVAC Contractors

The most common air conditioning, heating and ventilation system repairs and services are listed below for your convenience. We’ve also included a list of the most popular brands of HVAC units available in San Mateo County, including in the larger cities of Sunset District, San Mateo, Redwood City, South San Francisco, San Bruno, Pacifica, East Palo Alto, Menlo Park, Foster City and Burlingame and the greater Bay Area.

AC Repair (Air Conditioner Repair)
San Mateo County HVAC contractors perform residential air conditioner repairs to fix broken AC units, replace failing air conditioner parts, upgrade air conditioners with new parts that are more energy efficient and prepare AC units for seasonal use.

Heater Repair (Furnace Repair)
As with home air conditioner repairs, home heater repairs upgrade old furnace parts, repair broken furnaces, replace failing heater parts and make old heaters more energy efficient for winter home heating. Heater repair technicians can also check for dangerous furnace emissions, such as carbon monoxide, and can fix any potential leaks.

Furnace Installation
New furnaces can be installed by local San Mateo County heating and cooling companies. Furnace installers may put in stand-alone furnaces, or can install a new furnace as part of a home heating and cooling system. In order to get the best results and ensure the safety of your new home heater, furnace installation should only be done by an experienced professional.

HVAC Unit Installation
HVAC unit installation is a complicated process involving determining which size of heating and cooling equipment is needed, which brand and model of HVAC unit is best for your needs, detailed installation methods to keep air conditioner and furnace warrantees intact, and the actual installation process which must be done correctly in order to preserve the safety and integrity of the equipment. Experts recommend that HVAC equipment, including air conditioners, heaters, home ventilation systems, boiler systems and furnaces, should be installed by professional HVAC installation companies.

Heating and Air Conditioning Unit Repairs
Air conditioning and heating unit repairs include repairs to the heating and cooling elements, air intake, fans and mechanical components of HVAC units.

Home Ventilation System Installation & Repair
Home ventilation system installation and repairs in San Mateo County deal with the air intake vents, exhaust fans, home ventilator, air ducts and ventilation system controls. Some ventilation systems are integrated with heating and cooling systems while others are stand-alone ventilation systems. Residential ventilation systems remove stale air from the home, bring in fresh air from outside, and move the air around inside the home.

Energy Star HVAC Systems
Energy Star HVAC systems sold in San Mateo County are heating and cooling units that are Energy Star certified. Energy Star is labeling system designed by the US Environmental Protection Agency and the US Department of Energy. Energy Star heating and cooling systems, air conditioners, furnaces, boilers and other home comfort systems are extensively tested to ensure high efficiency standards.

Portable Air Conditioning Units in San Mateo County
Often seen as window air conditioners or compact air conditioners on wheels, portable air conditioning units are small, movable AC units that are not permanently installed and can be moved from room to room.

Central Air Conditioner Installation in San Mateo County
Central air conditioners are cooling and dehumidifying systems that work from a central location in a home or business to distribute cool air throughout the building. Central air conditioners are often installed together with central heating furnaces and are known as HVAC units.

Residential Heating and Cooling System Installation
San Mateo County HVAC companies offer installation of* residential heating and cooling systems. Installation generally includes removal of old HVAC equipment, installation and custom fitting of new heating and cooling components.

Common Heating and Cooling System Brand Requests for HVAC Equipment in San Mateo County

  • Trane Air Conditioning Units
  • Carrier Furnaces & Air Conditioners
  • Goodman Air Conditioners
  • Air Con Systems
  • Frigidaire Air Conditioners
  • Mitsubishi Air Conditioners
  • Bryant Furnaces
  • Amana Air Conditioning & Heaters
  • Lennox Air Conditioning & Furnaces
  • Kenmore Air Conditioners & Heating Units
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Glossary Of Terms
Heating, Cooling and Ventilation Glossary of Terms

air conditioner
A piece of home cooling equipment that controls indoor air temperature, humidity, air quality, and movement of cool air. Air conditioning units can be portable air conditioners or central air conditioning systems that stand alone or are part of an integrated HVAC system.

Also known as: air conditioning, home air conditioner, residential air conditioner, air conditioning unit

air filter
An air filter is the device used to remove unwanted particles, dust, vapors, and odors from indoor air. Air filters have two functions: protecting home HVAC equipment from damage and improving indoor air quality.

Also known as: air filtration units, home air filters, air conditioner filters, furnace filters, HVAC filters

air handler
Heating and cooling systems have air handlers, the piece of equipment that forces hot and cool air through ductwork and out the air vents.

Also known as: air handling system, air fan, HVAC air handler

BTU rating
BTU stands for British Thermal Units. BTUs measure the amount of heat needed to raise one pound of water one degree Fahrenheit. The higher an HVAC system’s BTU rating, the larger the heating capacity of the air conditioner or furnace. Larger homes with more space to heat and cool require HVAC systems with higher BTU ratings.

Also known as: British Thermal Units, BTU ratings, heating capacity rating, cooling capacity rating

Home heating boilers heat air using steam and hot water. Some boilers may be more efficient at providing even, draft-free heat than forced-air heaters.

Also known as: hot water steam boiler, boiler system, low pressure boilers, high pressure boilers, steam boiler, hot water boiler, steam system, gas system, oil system, boiler furnace

Capacity is defined as the ability of a heating and cooling system to heat or cool a space. When measured, the cooling capacity of an air conditioning system is generally stated in tons while heating capacity of furnaces and home heaters are measured in BTUs.

Also known as: heating ability, air conditioning ability, cooling ability, HVAC unit capacity

carbon monoxide
Carbon monoxide is a colorless, odorless, toxic gas that is produced when carbon fuels are burned. Carbon monoxide, also commonly called CO2, can leak into a home or business when furnaces or HVAC equipment becomes worn, leaky or is not correctly maintained.

Also known as: CO, CO2

central air conditioning system
Systems that cool indoor air and dehumidify it in one central location and then deliver the cooler air via a system of ducts are known as central air conditioning systems.

Also known as: central air systems, central air conditioning units, central airconditioning

downflow furnace
Downflow furnaces take in cool air at the top of the furnace unit and blow warm air out the bottom of the unit.

Also known as: down flow furnace

Metal duct pipes that form a system of ducts throughout a home or building are referred to as ductwork. Ductwork is used to transfer and circulate air from a heating, cooling and ventilation system throughout the building.

Also known as: ducts, duct system, ductwork system, stainless steel ducts

Energy Star
Developed and trademarked by the US Department of Energy and the Environmental Protection Agency. Energy Star is a government-sponsored branding program that tests and labels energy efficient appliances and products.

Also known as: Energy Star rated HVAC units, Energy Star appliances, Energy Star heaters, Energy Star air conditioners, eco-friendly HVAC, Energy Star systems

forced air
Systems for heating, cooling and ventilation that use fans and blowers to move air through the HVAC system and into the home or business are known as forced air systems.

Also known as: forced air system, forced air HVAC system, forced air HVAC unit

Self-contained heating units that heat air in homes and buildings are referred to as furnaces. Furnaces may be stand-alone heaters or can be part of a heating, cooling and ventilation system. Some furnaces provide central heating by heating air in one central location and then dispersing it through ducts to heat an entire home while other heaters are portable furnaces.

Also known as: heaters, home furnace, heater unit, home heating unit, HVAC system, gas furnace, electric furnace, free-standing furnace, central heating unit

HVAC stands for heating, ventilation and air conditioning. It refers to air conditioning and heating systems in homes and other buildings. HVAC can also be used to describe the trade of installing, maintaining and servicing HVAC equipment.

Also known as: heating, cooling and ventilation; heating, cooling, ventilation; heating and cooling; heating and cooling systems; HVACR; heating, ventilation, air conditioning, refrigeration

heat pump
The heat pump is the unit that handles both heating and cooling. In some climates, a heat pump may handle your heating and cooling needs more efficiently than a furnace and air conditioner.

Also known as: heater pump, heating pump, home heat pump

horizontal flow furnace
Horizontal flow furnaces are installed on their sides, enabling them to draw in air from one side, heat the air and push it out the other side to heat the room.

Also known as: furnace, side furnace, horizontal furnace

heating seasonal performance factor
Heating seasonal performance factor measures the heating efficiency of heat pumps. The higher a heat pump’s HSPF, the more efficiently the heat pump works.

Also known as: HSPF

Humidifiers add moisture to the air. Stand alone humidifiers are portable and can be moved from room to room. Other humidifiers are available as permanent equipment additions to HVAC systems to add moisture to air as it comes out of the furnace to keep the air in a home or building from becoming too dry when the heater is running.

Also known as: home humidifier, air humidifier, humidifying system

load calculation
Load calculation is a way of computing the cooling and heating power an HVAC system must produce for indoor comfort. The load is influenced by many factors: climate, square footage of conditioned area, orientation and layout of the building, number of human occupants, room count and dimensions, window and door count and characteristics, insulation quantity and quality, and more.

Also known as: heat gain and loss calculation, heat loss calculation, heat gain calculation, load calculator, HVAC unit load calculation, heating & cooling load calculation, HVAC system load calculator

package system
An outdoor unit that houses heating and cooling blower and coil components, package systems provide heating and cooling for an entire building or home.

Also known as: packaged heat pump, package heat pump, packaged system, package air conditioner, packaged air conditioner, electric cooling package system, gas heating package system, electric heating package system

As used in an air conditioner or air conditioning component of an HVAC system, any chemical used to cool the air is referred to as refrigerant.

Also known as: air conditioning, home cooling, chemical refrigeration, refrigeration, chemical refrigerant

seasonal energy efficiency rating
SEER measures an air conditioner or HVAC unit’s cooling efficiency. The higher the SEER number, the greater the efficiency of the unit.

Also known as: SEER

A thermostat is a device that monitors and controls the temperature inside a home or building. Thermostats may be manually set or can be programmable thermostats that are pre-set to heat and cool buildings at a certain time.

Also known as: programmable thermostats, wireless thermostats, touch screen thermostats, home thermostats, HVAC thermostats, heating and cooling thermostats, digital thermostat, home  comfort control

upflow furnace
An upflow furnace draws cool air from the bottom of the unit and blows warmed air from the top.

Also known as: forced air furnace

ventilation system
Home ventilation systems exchange stale indoor air with to fresh air from outside the home. Ventilation systems often filter the incoming air. Ventilation components are often a standard part of home heating and cooling systems.

Also known as: home ventilators, HVAC system, home ventilation system

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Frequently Asked Questions
FAQ About Local Heating and Cooling Services

Q: Why choose a Diamond Certified HVAC company?
A: Diamond Certified helps you choose a local heating and cooling contractor with confidence by offering a list of top-rated local companies who have passed the country’s most in-depth rating process. Only furnace and air conditioning companies rated Highest in Quality earn the prestigious Diamond Certified award. Most companies can’t pass the ratings. American Ratings Corporation also monitors every Diamond Certified company with in-depth and ongoing research and ratings. And your purchase is backed by the Diamond Certified Performance Guarantee. So you’ll feel confident choosing a Diamond Certified heating and cooling company.

Q: How do I know when it’s time to replace my old HVAC equipment?
A: Only a thorough examination from a good heating and cooling contractor will tell you for sure if you need a new home comfort system, but there are a few tell-tale signs that it may be time to replace your HVAC unit:

  • If your furnace, boiler, heat pump, air conditioner or HVAC system is more than 10-15 years old, you may want to consider replacing it with a newer, more energy efficient system.
  • If your HVAC equipment needs frequent repairs, doesn’t seem to be heating and cooling your home as well as it used to, or your energy bills are going up.
  • Sudden humidity problems in your home may be a sign of a poorly-operating HVAC system or heating and cooling equipment failure.
  • Your HVAC system is very noisy when it runs or seems to be struggling to keep up with your heating and cooling needs. This could signal an undersized system or an underperforming HVAC unit.
  • Excessive dust can be a sign of leaky HVAC ducts.

Q: Some rooms in my house are too hot while others are too cold. What could be causing this?
A: Rooms that are too hot or too cold can be caused by duct work problems, poor home insulation, inefficient HVAC equipment or a failing heating and cooling system. You should call a qualified heating and cooling contractor for a home energy audit and a check of your HVAC system. A good HVAC contractor should be able to determine what is causing the temperature fluctuations and tell you the best way to fix the problem.

Q: How often should I have my home HVAC system serviced?
A: Most HVAC companies recommend having your heating and air conditioning equipment checked at least once a year. Some companies advise having a qualified HVAC technician test your heater/furnace in the fall and your air conditioning tested in the spring. HVAC servicing may help your system last longer and stay efficient because regular heating and cooling system maintenance can help locate problems and fix them before they cause an HVAC system failure, help your system run at peak performance and cut down energy costs, maintain healthy and safe operation, and can prolong the life of the furnace and air conditioner equipment.

Q: What features should I look for in a home heating and cooling system?
A: Home comfort systems come with many different features. Your heating and cooling specialist should help you determine which features are best for you, but you may want to spend some time thinking about what is important to you before selecting a home air conditioning unit and furnace. Some HVAC unit features you may wish to consider include home climate control devices such as programmable thermostats, HVAC system noise reduction units, cooling and heating units that preserve home air quality, and high efficiency equipment that helps save money and is better for the environment.

Q: Why should I consider an Energy Star furnace and air conditioner?
A: Energy Star HVAC systems are those that have tested as high efficiency in the Energy Star labeling system designed by the EPA and the US Department of Energy. Energy Star air conditioners, furnaces, boilers and HVAC units may offer better efficiency standards and lower operating costs and environmental costs than competing heating and cooling systems that are not Energy Star certified.

Q: How long will it take to replace my AC and furnace equipment?
A: The amount of time for installation depends on the size of your job, the work you’re having done and the experience level and detail of your heating and cooling contractor. It can take as few as one or two days to add on to an existing HVAC system and up to a week or more to install new furnaces and AC systems. Good contractors will take the necessary time to modify your new heating and cooling unit and ductwork to exactly fit your home.

Q: Do I really need to hire a local heating, cooling and ventilation contractor or can I just install my new HVAC system myself?
A: Poorly-installed HVAC systems can be more expensive to run, can wear out sooner than correctly-installed heating and cooling systems and can even pose a danger to your health. If HVAC systems are installed incorrectly, they can even leak toxic gasses into your home. So it’s important to hire a skilled, licensed HVAC contractor to install, service and inspect your home heating and cooling system. HVAC contractors who know how to do their jobs correctly will install systems without gaps in the ductwork, so systems are more efficient and last years longer than poorly-installed systems.

Q: What is the difference between an upflow furnace, downflow furnace and horizontal furnace?
A: These terms simply refer to how a furnace delivers air. An upflow furnace delivers hot or cold air upwards, pushing heated or air conditioned air up from the top of the furnace into an overhead HVAC duct system and then out through heater vents or air conditioning vents. A downflow furnace is the opposite, pushing air down through the bottom of the furnace and into the home duct system that runs beneath it. Horizontal furnaces, as the name suggests, lay on their side and push the cooled or heated air out into the ducts from a prone position. Horizontal furnaces are most often used in attics, basements or tight spaces because they maximize space.

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